RED DSMC2: 8K Helium, 5K Gemini

There are many reasons to shoot in 8K then edit in 4K or HD 1080. If you are concerned about file sizes, use a higher compression and with oversampling your data still gives a better image than windowing to 4K on this sensor. 8K avoids focal length crop factor. VFX compositing is better. Still images to be pulled from video. The option to push in to reframe and crop in post is very useful.